update defconfig with ubuntu requirements

Reasons:

*_NS to enable support for containers
SWAP because we're still using a swap file by default
Without paranoid_network disabled, the browser won't work correctly
For debugging while hardware bringup you may also want to enable

CONFIG_PANIC_TIMEOUT=5 CONFIG_ANDROID_RAM_CONSOLE=y

The Ubuntu boot image and initramfs may not work at first so these two help read /proc/last_kmsg in case of a boot loop due to a kernel panic from the recovery image - which should work already, being more or less standard Android based.